超大 TXT 文本读取记录

Author： Quan
发布时间：November 25, 2020
7339views
4 comments
5345 words
Categories：主页代码

## 前言

这两天搞到一个 18GB 大的 txt 文本文件，于是就想尝试各种读取方式，并对比速度。

使用语言：Python

## 正文

### 单线程篇

最简单最粗暴的方法，直接读！

#### 单线程 V1 代码

```python
def open_file():
    with open('F:\\Downloads\\6.9更新总库.txt', 'rb') as f:
        for line in f:
           yield str(line, encoding="utf-8")

def find(findQQ):
    datas = open_file()
    for data in datas:
        # print(data)
        qq = data.split("----")[0]
        # mobile = data.split("----")[1]
        if qq==findQQ:
            print(data)
            break
```

HDD 下读取文件速度：

![image-20201125163341981](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125163341981.png)

SSD 下读取文件速度：

![image-20201125163742389](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125163742389.png)

居然没有速度 ？？？

![image-20201125164021764](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164021764.png)

过一会后速度上来了，HDD、SSD速度相差不大，看来瓶颈不在存储介质。

#### 单线程 V2 代码

优化后的版本

```python
def open_file2(QQ,path):
    length = len(QQ)
    with open(path, 'rb') as f:
        for line in f:
           # print(line)
           count=0
           for i in range(0,length):
                if line[i]!=QQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    # print(line[length+1])
                    # print(line[length])
                    if line[length]==45:
                        print(line)
                        return line
```

HDD 下的读取速度：

![image-20201125164501364](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164501364.png)

SSD 下的读取速度：

![image-20201125164340525](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164340525.png)

优化后的代码比原来快了一倍左右。

### 多线程篇

#### 多线程 V1 代码

```python
# 先计算出对应线程每块开始的位置 即为找到 ‘\n’字符 ，在前后 10+4+11+2 字节处 搜索
# 在按这个去分配
def findOffsets(ThreadSize,FilePath):
    List_StartPiece_Offset = []
    # 添加第一块的起点位置
    List_StartPiece_Offset.append(0)
    file_size = os.path.getsize(FilePath)
    PieceSize = int(file_size/ThreadSize)
    # print(PieceSize)
    with open(FilePath,'rb') as f:
        for piece_number in range(1,ThreadSize):
            f.seek(piece_number*PieceSize)
            # 向后寻找
            for offset in range(0,27):
                if f.read(1)==b'\n':
                    # print(f.tell())
                    List_StartPiece_Offset.append(f.tell())
            # # 向前找
            # for offset in range(0,27):
            #     f.seek(-2,1)
            #     if f.read(1)==b'\n':
            #         print(f.tell())
            #         List_StartPiece_Offset.append(f.tell())

f.close()
    file_size = os.path.getsize(FilePath)
    List_StartPiece_Offset.append(file_size)
    return List_StartPiece_Offset
def findPhone(start,end,qq,path):
    length = len(qq)
    with open(path, 'rb') as f:
        f.seek(start)
        for line in f:
            # print(line)
            if f.tell()>=end:
                break
            count=0
            for i in range(0,length):
                if line[i]!=qq[i]:
                    break
                else:
                    count+=1
                if count==length:
                    # print(line[length+1])
                    # print(line[length])
                    if line[length]==45:
                        print(line)
                        global Flag
                        Flag=False
                        f.close()
                        return line
            # break
        f.close()
        return b''
def findMain(QQ,FilePath,ThreadSize):
    list = findOffsets(ThreadSize,FilePath)
    print(list)

try:
        for tmp in range(0,len(list)-1):
            _thread.start_new_thread( findPhone, (list[tmp],list[tmp+1],QQ,FilePath) )
    except BaseException as e:
        print ("Error: 无法启动线程 "+str(e))
    # print(threading.activeCount())
    while Flag:
        # print(Flag)
        pass
```

读取速度 HDD、SSD 差不多：

![image-20201125164928168](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164928168.png)

两个线程、5线程，都没速度。很奇怪，暂时没找到原因。

可能原因如下：

![img](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/3_UAWLV6ETTF@2~_R%7DFMWCU.png)

#### 多线程 V2 代码

经过查阅资料放弃了。。。

### 大文件分块

既然整个读不现实，那就分块了来读。

#### V1 代码

```python
# 大文本分块
def cutPiece(size,path):
    list = findOffsets(size,path)
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            tmp_piece = big_f.read(list[i+1]-list[i])
            with open('piece\\qq_'+str(i)+'.txt','wb') as small_f:
                small_f.write(tmp_piece)
                small_f.close()
        big_f.close()
```

这只是按份数等大分块，对实际查询帮助不大。

#### 按余数分块 V1 代码

```python
# 按余数分块
# 大文本分块 耗时：0:02:08.998875
def cutRemainderPiece(size,path):
    list = findOffsets(size,path)
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            tmp_piece = big_f.read(list[i+1]-list[i])
            # print(type(tmp_piece))
            str_piece = str(tmp_piece, encoding = "utf-8")
            list_piece = str_piece.split('\r\n')
            for tmp in list_piece :
                tmpp=tmp.split("----")
                if len(tmpp[0])<=0:
                    continue
                m = int(int(tmpp[0])%size)
                with open('piece2\\qq_'+str(m)+'.txt','a') as small_f:
                    small_f.write(tmp+'\n')
                    small_f.close()
            break
        big_f.close()
```

#### 按余数分块V2 代码

```python
# 大文本分块V2 耗时：0:00:02.572516
def cutRemainderPiece_V2(size,path):
    list = findOffsets(size,path)
    allPiece=[]
    for i in range(0,1000):
        allPiece.append('')

for i in range(0,len(list)-1):
        for i in range(0,1000):
            allPiece[i]=''
        with open(path,'rb') as big_f:
            # big_f.flush()
            tmp_piece = big_f.read(list[i+1]-list[i])
            # print(type(tmp_piece))
            str_piece = str(tmp_piece, encoding = "utf-8")
            list_piece = str_piece.split('\r\n')
            for tmp in list_piece :
                tmpp=tmp.split("----")
                if len(tmpp[0])<=0:
                    continue
                m = int(int(tmpp[0])%size)
                allPiece[m]+=tmp+'\n'
            for i in range(0,1000):
                with open('piece2\\qq_'+str(i)+'.txt','a') as small_f:
                    small_f.write(allPiece[i])
                    small_f.close()
            # break
            big_f.close()
```

对比 v1、v2，两者时间差距巨大，原因是 v1 的 IO 过于密集，于是 v2 优化为都暂时存在内存，等一个块处理完了，再写入磁盘，速度由原先的 129s 提升到 3s。

### 按余数分块 V3 代码

v1，v2其实都是有 bug 的并不能很好的分割，因此 v3 诞生了1

```python
def cutRemainderPiece_V2(size,path):
    list = findOffsets(size,path)
    logging.debug(list)
    allPiece=[]
    for i in range(0,size):
        allPiece.append('')
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            for j in range(0,size):
                allPiece[j]=''
            # big_f.flush()
            print(str(list[i])+'----'+str(i))
            tmp_piece = big_f.read(list[i+1]-list[i])
            # logging.debug(type(tmp_piece))
            str_piece = str(tmp_piece, encoding = "utf-8")
            list_piece = str_piece.split('\r\n')
            for tmp in list_piece :
                if len(tmp)>25:
                    logging.debug('错误行1：'+str(tmp))
                    continue
                tmpp=tmp.split("----")
                if len(tmpp[0])<5 or len(tmpp)<2:
                    logging.debug('错误行2：'+str(tmp))
                    continue
                try:
                    m = int(int(tmpp[0])%size)
                    allPiece[m]+=tmp+'\n'
                except:
                    logging.debug('错误行3：'+str(tmp))

for i in range(0,1000):
                with open('piece\\qq_'+str(i)+'.txt','a') as small_f: # 0:00:02.259968
                # with open('\\\\Desktop-93nkdgi\\d\\piece\\qq_'+str(i)+'.txt','a') as small_f:
                    small_f.write(allPiece[i])
                    small_f.close()
            # print(allPiece[0]) # 1375309000----15070084341
            # break
        big_f.close()
```

大概 1 个小时分完，分完后查询大概 1s 不到

### 按余数查询

#### 异步查询

````python
# 异步求余查询
async def findQQPiece(findQQ,path):
    result = []
    async with aiofiles.open(path, 'rb') as f:
        bytes_all= await f.read()
        str_all = str(bytes_all,encoding='UTF-8')
        list_all = str_all.split('\r\n')
        for tmp in list_all:
            qq = tmp.split('----')[0]
            if qq == findQQ:
                phone = tmp.split('----')[1]
                result.append(phone)
        return result
````

#### 同步查询

````python
# 同步求余查询
def findQQPiece2(findQQ,path):
    findQQ=bytes(findQQ, encoding = "utf8")
    length = len(findQQ)
    result = []
    with open(path, 'rb') as f:
        for line in f:
            # print(line)
            count=0
            for i in range(0,length):
                if line[i]!=findQQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    if line[length]==45:
                        logging.debug(line)
                        # print(line)
                        tmp = str(line,encoding='UTF-8')
                        result.append(tmp.split('----')[1].strip())
                        count=0
    return result
````

### 完整代码

```python
import datetime
import time
import aiofiles
import asyncio
import os
import _thread
import threading
import pymysql
import logging

Flag = True

def open_file():
    # with open('F:\\Downloads\\6.9更新总库.txt', 'rb') as f:
    with open('C:\\Users\\14470\\Desktop\\6.9更新总库.txt', 'rb') as f:
        for line in f:
           yield str(line, encoding="utf-8")

def find(findQQ):
    datas = open_file()
    for data in datas:
        # logging.debug(data)
        qq = data.split("----")[0]
        # mobile = data.split("----")[1]
        if qq==findQQ:
            logging.debug(data)
            break

def open_file2(QQ,path):
    length = len(QQ)
    with open(path, 'rb') as f:
        for line in f:
            if len(line)<20:
                logging.debug(line)
            count=0
            for i in range(0,length):
                if line[i]!=QQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    # logging.debug(line[length+1])
                    # logging.debug(line[length])

if line[length]==45:
                        count=0
                        logging.debug(line)
                        # return line
        #    break

async def open_file3(findQQ):
    length = len(findQQ)
    async with aiofiles.open('F:\\Downloads\\6.9更新总库.txt', 'rb') as f:
        async for line in f:
            # logging.debug(line)
            count=0
            for i in range(0,length):
                if line[i]!=findQQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    if line[length]==45:
                        # logging.debug(line)
                        return line
        return b''

async def open_file3(findQQ,offset):
    length = len(findQQ)
    async with aiofiles.open('F:\\Downloads\\6.9更新总库.txt', 'rb') as f:
        f.seek(offset=offset,whence=0)
        async for line in f:
            # logging.debug(line)
            count=0
            for i in range(0,length):
                if line[i]!=findQQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    if line[length]==45:
                        # logging.debug(line)
                        return line
        return b''

# 先计算出对应线程每块开始的位置 即为找到 ‘\n’字符 ，在前后 10+4+11+2 字节处 搜索
# 在按这个去分配
def findOffsets(ThreadSize,FilePath):
    List_StartPiece_Offset = []
    # 添加第一块的起点位置
    List_StartPiece_Offset.append(0)
    file_size = os.path.getsize(FilePath)
    PieceSize = int(file_size/ThreadSize)
    # logging.debug(PieceSize)
    curros = 0 # 游标
    with open(FilePath,'rb') as f:
        for piece_number in range(1,ThreadSize):
            f.seek(piece_number*PieceSize)
            f.readline()
            logging.debug(f.readline())
            List_StartPiece_Offset.append(f.tell())
            # 向后寻找
            # for offset in range(0,60):
            #     if f.read(1)==b'\r':
            #         if f.read(1)==b'\n':
            #             curros = f.tell()
            #             List_StartPiece_Offset.append(curros)
            #             break
            # # 向前找
            # for offset in range(0,27):
            #     f.seek(-2,1)
            #     if f.read(1)==b'\n':
            #         logging.debug(f.tell())
            #         List_StartPiece_Offset.append(f.tell())

f.close()
    file_size = os.path.getsize(FilePath)
    List_StartPiece_Offset.append(file_size)
    return List_StartPiece_Offset
def findPhone(start,end,qq,path):
    length = len(qq)
    with open(path, 'rb') as f:
        f.seek(start)
        for line in f:
            # logging.debug(line)
            if f.tell()>=end:
                break
            count=0
            for i in range(0,length):
                if line[i]!=qq[i]:
                    break
                else:
                    count+=1
                if count==length:
                    # logging.debug(line[length+1])
                    # logging.debug(line[length])
                    if line[length]==45:
                        logging.debug(line)
                        global Flag
                        Flag=False
                        f.close()
                        return line
            # break
        f.close()
        return b''
def findMain(QQ,FilePath,ThreadSize):
    list = findOffsets(ThreadSize,FilePath)
    logging.debug(list)

try:
        for tmp in range(0,len(list)-1):
            _thread.start_new_thread( findPhone, (list[tmp],list[tmp+1],QQ,FilePath) )
    except BaseException as e:
        logging.debug ("Error: 无法启动线程 "+str(e))
    # logging.debug(threading.activeCount())
    while Flag:
        # logging.debug(Flag)
        pass
def findMain2(QQ,FilePath,ThreadSize):
    list = findOffsets(ThreadSize,FilePath)
    logging.debug(list)
    FilePathHDD = 'F:\\Downloads\\6.9更新总库.txt'               # 0:07:38.443549
    FilePathSSD = 'C:\\Users\\14470\\Desktop\\6.9更新总库.txt' # 0:07:12.953106
    try:
        _thread.start_new_thread( findPhone, (list[0],list[1],QQ,FilePathHDD) )
        _thread.start_new_thread( findPhone, (list[1],list[2],QQ,FilePathSSD) )
    except BaseException as e:
        logging.debug ("Error: 无法启动线程 "+str(e))
    # logging.debug(threading.activeCount())
    while Flag:
        # logging.debug(Flag)
        pass

# 大文本分块
def cutPiece(size,path):
    list = findOffsets(size,path)
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            tmp_piece = big_f.read(list[i+1]-list[i])
            with open('piece\\qq_'+str(i)+'.txt','wb') as small_f:
                small_f.write(tmp_piece)
                small_f.close()
        big_f.close()

# 插入数据库

def open_piece_file(piece):
    with open('piece\\qq_'+str(piece)+'.txt', 'rb') as f:
        for line in f:
            yield str(line, encoding="utf-8")

def ini_sql():

db = pymysql.connect("localhost", "root", "123456", "qq")

return db

# 创建表
def createTable():
    db = ini_sql()
    for i in range(0,1000):
        sql = 'create table qq_' + str(i) +' (qq char(10),phone char(11)) '
        # logging.debug(sql)
        cursor = db.cursor()
        try:
            cursor.execute(sql)
            db.commit()
        except:
            db.rollback()
        cursor.close()
    db.close()
# 插入数据
def insterDB(startPiece,endPiece):
    starttime = datetime.datetime.now()
    logging.debug('线程开始：startPiece-endPiece: '+str(startPiece)+'-'+str(endPiece)+' 时间：'+str(starttime))
    db = ini_sql()
    for i in range(startPiece,endPiece):
        datas = open_piece_file(i)
        for data in datas:
            qq = data.split("----")[0]
            mobile = data.split("----")[1]
            table = int(qq)%1000
            sql = "insert into qq_"+str(table)+"(qq, phone) values('%s','%s')" % (qq, mobile)
            cursor = db.cursor()
            try:
                cursor.execute(sql)
                db.commit()
            except:
                db.rollback()
            cursor.close()

db.close()
    endtime = datetime.datetime.now()
    logging.debug (endtime - starttime)
    logging.debug('线程结束：startPiece-endPiece: '+str(startPiece)+'-'+str(endPiece)+' 消耗时间：'+str(endtime - starttime))
# 多线程插入
def insterMain(ThreadSize):
    size = int(1000 / ThreadSize)
    for i in range(0,size):
        try:
            _thread.start_new_thread( insterDB, (i*size,i*size+10) )
        except BaseException as e:
            logging.debug ("Error: 无法启动线程 "+str(e))
# logging.debug(threading.activeCount())
    while True:
        # logging.debug(Flag)
        pass

# 按余数分块
# 大文本分块 耗时：0:02:08.998875
def cutRemainderPiece(size,path):
    list = findOffsets(size,path)
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            tmp_piece = big_f.read(list[i+1]-list[i])
            # logging.debug(type(tmp_piece))
            str_piece = str(tmp_piece, encoding = "utf-8")
            list_piece = str_piece.split('\r\n')
            for tmp in list_piece :
                tmpp=tmp.split("----")
                if len(tmpp[0])<=0:
                    continue
                m = int(int(tmpp[0])%size)
                with open('piece2\\qq_'+str(m)+'.txt','a') as small_f:
                    small_f.write(tmp+'\n')
                    small_f.close()
            break
        big_f.close()

# 大文本分块V2 耗时：0:00:02.572516 | all 0:46:59.691256
def cutRemainderPiece_V2(size,path):
    list = findOffsets(size,path)
    logging.debug(list)
    allPiece=[]
    for i in range(0,size):
        allPiece.append('')
    with open(path,'rb') as big_f:
        for i in range(0,len(list)-1):
            for j in range(0,size):
                allPiece[j]=''
            # big_f.flush()
            print(str(list[i])+'----'+str(i))
            tmp_piece = big_f.read(list[i+1]-list[i])
            # logging.debug(type(tmp_piece))
            str_piece = str(tmp_piece, encoding = "utf-8")
            list_piece = str_piece.split('\r\n')
            for tmp in list_piece :
                if len(tmp)>25:
                    logging.debug('错误行1：'+str(tmp))
                    continue
                tmpp=tmp.split("----")
                if len(tmpp[0])<5 or len(tmpp)<2:
                    logging.debug('错误行2：'+str(tmp))
                    continue
                try:
                    m = int(int(tmpp[0])%size)
                    allPiece[m]+=tmp+'\n'
                except:
                    logging.debug('错误行3：'+str(tmp))

# 同步求余查询
def findQQPiece2(findQQ,path):
    findQQ=bytes(findQQ, encoding = "utf8")
    length = len(findQQ)
    result = []
    with open(path, 'rb') as f:
        for line in f:
            # print(line)
            count=0
            for i in range(0,length):
                if line[i]!=findQQ[i]:
                    break
                else:
                    count+=1
                if count==length:
                    if line[length]==45:
                        logging.debug(line)
                        # print(line)
                        tmp = str(line,encoding='UTF-8')
                        result.append(tmp.split('----')[1].strip())
                        count=0
    return result
# 异步求余查询
async def findQQPiece(findQQ,path):
    result = []
    async with aiofiles.open(path, 'rb') as f:
        bytes_all= await f.read()
        str_all = str(bytes_all,encoding='UTF-8')
        list_all = str_all.split('\r\n')
        for tmp in list_all:
            qq = tmp.split('----')[0]
            if qq == findQQ:
                phone = tmp.split('----')[1]
                result.append(phone)
        return result
async def testpiece():
    QQ='2679445157'
    m = int(int(QQ)%1000)
    re = findQQPiece2(QQ,str('F:\\Downloads\\piece\\qq_'+str(m)+'.txt'))
    # re = await findQQPiece(QQ,str('F:\\Downloads\\piece\\qq_'+str(m)+'.txt'))
    print(re)

if __name__ == "__main__":
    # logging.basicConfig(level='DEBUG')
    QQ=b'2679445157'
    FilePath = 'F:\\Downloads\\6.9更新总库.txt'               # 0:07:38.443549
    # FilePath = 'C:\\Users\\14470\\Desktop\\6.9更新总库.txt' # 0:07:12.953106
    ThreadSize = 2

starttime = datetime.datetime.now()
    # find(QQ)
    # asyncio.run(open_file3(findQQ))
    # open_file2(findQQ)
    # str = '13076120000'
    # logging.debug(str[0:3])
    # logging.debug(str[-2:])
    file_size = os.path.getsize(FilePath)
    print(float(file_size)/(1024.0*1024.0*1024.0),end='GB\n')

# 多线程版本
    # findMain(QQ,FilePath,ThreadSize)
    # 多线程版本 两个文件
    # findMain2(QQ,FilePath,ThreadSize)
    # 单线程
    # open_file2(QQ=QQ,path='F:\\Downloads\\piece\\qq_0.txt')
    # open_file2(QQ=QQ,path=FilePath)

# 文件切割
    # cutPiece(1000,FilePath)
    # 创建表
    # createTable()
    # 插入数据测试
    # insterDB(0,1)
    # 多线程插入
    # insterMain(100)

# 取余分块
    # cutRemainderPiece_V2(1000,FilePath)
    # 异步查询
    # asyncio.run(testpiece())
    loop = asyncio.get_event_loop()
    loop.run_until_complete(testpiece())

endtime = datetime.datetime.now()
    print (endtime - starttime)

```

Last modification：November 27th, 2020 at 11:02 am

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4 comments

ghc
August 25th, 2021 at 03:59 pm

大佬来一份java或者go得代码
Small Stars
February 10th, 2021 at 05:47 pm

Quan姐姐太棒啦
1
December 5th, 2020 at 10:51 am

大佬数据给我一份试试呗
1
November 28th, 2020 at 10:38 am

超大 TXT 文本读取记录

Quan • 2020 年 11 月 25 日

## 前言

这两天搞到一个 18GB 大的 txt 文本文件，于是就想尝试各种读取方式，并对比速度。

使用语言：Python

## 正文

### 单线程篇

最简单最粗暴的方法，直接读！

#### 单线程 V1 代码

```python
def open_file():
    with open('F:\\Downloads\\6.9更新总库.txt', 'rb') as f:
        for line in f:
           yield str(line, encoding="utf-8")

HDD 下读取文件速度：

![image-20201125163341981](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125163341981.png)

SSD 下读取文件速度：

![image-20201125163742389](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125163742389.png)

居然没有速度 ？？？

![image-20201125164021764](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164021764.png)

过一会后速度上来了，HDD、SSD速度相差不大，看来瓶颈不在存储介质。

#### 单线程 V2 代码

优化后的版本

HDD 下的读取速度：

![image-20201125164501364](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164501364.png)

SSD 下的读取速度：

![image-20201125164340525](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164340525.png)

优化后的代码比原来快了一倍左右。

### 多线程篇

#### 多线程 V1 代码

读取速度 HDD、SSD 差不多：

![image-20201125164928168](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/image-20201125164928168.png)

两个线程、5线程，都没速度。很奇怪，暂时没找到原因。

可能原因如下：

![img](https://cdn.jsdelivr.net/gh/Quan666/CDN/pic/3_UAWLV6ETTF@2~_R%7DFMWCU.png)

#### 多线程 V2 代码

经过查阅资料放弃了。。。

### 大文件分块

既然整个读不现实，那就分块了来读。

#### V1 代码

这只是按份数等大分块，对实际查询帮助不大。

#### 按余数分块 V1 代码

#### 按余数分块V2 代码

```python
# 大文本分块V2 耗时：0:00:02.572516
def cutRemainderPiece_V2(size,path):
    list = findOffsets(size,path)
    allPiece=[]
    for i in range(0,1000):
        allPiece.append('')

### 按余数分块 V3 代码

v1，v2其实都是有 bug 的并不能很好的分割，因此 v3 诞生了1

大概 1 个小时分完，分完后查询大概 1s 不到

### 按余数查询

#### 异步查询

#### 同步查询

### 完整代码

```python
import datetime
import time
import aiofiles
import asyncio
import os
import _thread
import threading
import pymysql
import logging

Flag = True

if line[length]==45:
                        count=0
                        logging.debug(line)
                        # return line
        #    break

f.close()
    file_size = os.path.getsize(FilePath)
    List_StartPiece_Offset.append(file_size)
    return List_StartPiece_Offset
def findPhone(start,end,qq,path):
    length = len(qq)
    with open(path, 'rb') as f:
        f.seek(start)
        for line in f:
            # logging.debug(line)
            if f.tell()>=end:
                break
            count=0
            for i in range(0,length):
                if line[i]!=qq[i]:
                    break
                else:
                    count+=1
                if count==length:
                    # logging.debug(line[length+1])
                    # logging.debug(line[length])
                    if line[length]==45:
                        logging.debug(line)
                        global Flag
                        Flag=False
                        f.close()
                        return line
            # break
        f.close()
        return b''
def findMain(QQ,FilePath,ThreadSize):
    list = findOffsets(ThreadSize,FilePath)
    logging.debug(list)

# 插入数据库

def open_piece_file(piece):
    with open('piece\\qq_'+str(piece)+'.txt', 'rb') as f:
        for line in f:
            yield str(line, encoding="utf-8")

def ini_sql():

db = pymysql.connect("localhost", "root", "123456", "qq")

return db

# 文件切割
    # cutPiece(1000,FilePath)
    # 创建表
    # createTable()
    # 插入数据测试
    # insterDB(0,1)
    # 多线程插入
    # insterMain(100)

# 取余分块
    # cutRemainderPiece_V2(1000,FilePath)
    # 异步查询
    # asyncio.run(testpiece())
    loop = asyncio.get_event_loop()
    loop.run_until_complete(testpiece())

endtime = datetime.datetime.now()
    print (endtime - starttime)

```

超大 TXT 文本读取记录

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超大 TXT 文本读取记录